package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;

    /**
     * 根据id删除分类 但是删除之前需要判断分类是否关联菜品
     *
     * @param id
     */
    @Override
    public void remove(Long id) {
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<Dish>();
        // 添加查询条件 根据分类id
        dishLambdaQueryWrapper.eq(Dish::getCategoryId, id);
        long dishCount = dishService.count(dishLambdaQueryWrapper);
        // 查询当前分类是否关联菜品 如果已经关联 则抛出业务异常
        if (dishCount > 0) {
            // 已经关联菜品 抛出异常
            throw new CustomException("当前分类下关联了菜品,不能删除");
        }

        // 查询当前分类是否关联套餐 如果已经关联 则抛出业务异常
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<Setmeal>();
        // 添加查询条件 根据分类id
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId, id);
        long setmealCount = setmealService.count(setmealLambdaQueryWrapper);
        if (setmealCount > 0) {
            // 已经关联套餐 抛出异常
            throw new CustomException("当前分类下关联了套餐,不能删除");
        }

        // 正常删除
        super.removeById(id);

    }
}
